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Phys Rev Lett. 2016 Apr 22;116(16):161801. doi: 10.1103/PhysRevLett.116.161801. Epub 2016 Apr 19.

Observation of the Decay B_{s}^{0}→K^{0}K[over ¯]^{0}.

Pal B1, Schwartz AJ1, Abdesselam A2, Adachi I3,4, Aihara H5, Asner DM6, Aushev T7,8, Ayad R2, Aziz T9, Babu V9, Badhrees I10,2, Bahinipati S11, Bakich AM12, Barberio E13, Behera P14, Bhardwaj V15, Bhuyan B16, Biswal J17, Bobrov A18,19, Bozek A20, Bračko M17,21, Browder TE22, Červenkov D23, Chekelian V24, Chen A25, Cheon BG26, Chistov R7, Cho K27, Chobanova V24, Choi Y28, Cinabro D29, Dalseno J24,30, Dash N11, Doležal Z23, Drásal Z23, Drutskoy A7,31, Dutta D9, Eidelman S18,19, Farhat H29, Fast JE6, Fulsom BG6, Gaur V9, Garmash A18,19, Gillard R29, Goh YM26, Goldenzweig P32, Greenwald D33, Grzymkowska O20, Haba J3,4, Hara T3,4, Hayasaka K34, Hayashii H35, He XH36, Hou WS37, Inami K38, Ishikawa A39, Iwasaki Y4, Jacobs WW40, Jaegle I22, Jeon HB41, Joffe D42, Joo KK43, Julius T13, Kang KH41, Kato E39, Kawasaki T44, Kiesling C24, Kim DY45, Kim HJ41, Kim KT46, Kim MJ41, Kim SH26, Kinoshita K1, Kodyš P23, Korpar S17,21, Križan P17,47, Krokovny P18,19, Kuhr T48, Kumar R49, Kumita T50, Kuzmin A18,19, Kwon YJ51, Lee IS26, Li CH13, Li H40, Li L52, Li Gioi L24, Libby J14, Liventsev D4,53, Lukin P18,19, Luo T54, Masuda M55, Matvienko D18,19, Miyabayashi K35, Miyata H44, Mizuk R7,31, Mohanty GB9, Mohanty S9,56, Moll A24,30, Moon HK46, Mori T38, Mussa R57, Nakano E58, Nakao M3,4, Nanut T17, Natkaniec Z20, Nayak M14, Nisar NK59,9, Nishida S3,4, Ogawa S60, Okuno S61, Pakhlov P7,31, Pakhlova G7,8, Park CW28, Park H41, Paul S33, Pedlar TK62, Pesántez L63, Pestotnik R17, Petrič M17, Piilonen LE53, Pulvermacher C32, Rauch J33, Ribežl E17, Ritter M48, Rostomyan A64, Ryu S65, Sahoo H22, Sakai Y3,4, Sandilya S9, Sanuki T39, Sato Y38, Savinov V54, Schlüter T48, Schneider O66, Schnell G67,68, Schwanda C69, Seino Y44, Senyo K70, Seon O38, Seong IS22, Shebalin V18,19, Shibata TA71, Shiu JG37, Shwartz B18,19, Simon F24,30, Sohn YS51, Sokolov A72, Solovieva E7, Stanič S73, Starič M17, Stypula J20, Sumihama M74, Sumiyoshi T50, Tamponi U57,75, Teramoto Y58, Trabelsi K3,4, Uchida M71, Uehara S3,4, Uglov T7,8, Uno S3,4, Urquijo P13, Usov Y18,19, Van Hulse C67, Vanhoefer P24, Varner G22, Vinokurova A18,19, Vossen A40, Wagner MN76, Wang CH77, Wang MZ37, Wang XL53, Watanabe M44, Watanabe Y61, Williams KM53, Won E46, Yamaoka J6, Yelton J78, Yuan CZ79, Yusa Y44, Zhang ZP52, Zhilich V18,19, Zhulanov V18,19, Zupanc A17,47; Belle Collaboration.

Author information

1
University of Cincinnati, Cincinnati, Ohio 45221.
2
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
3
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
4
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
5
Department of Physics, University of Tokyo, Tokyo 113-0033.
6
Pacific Northwest National Laboratory, Richland, Washington 99352.
7
Institute for Theoretical and Experimental Physics, Moscow 117218.
8
Moscow Institute of Physics and Technology, Moscow Region 141700.
9
Tata Institute of Fundamental Research, Mumbai 400005.
10
King Abdulaziz City for Science and Technology, Riyadh 11442.
11
Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
12
School of Physics, University of Sydney, New South Wales 2006.
13
School of Physics, University of Melbourne, Victoria 3010.
14
Indian Institute of Technology Madras, Chennai 600036.
15
University of South Carolina, Columbia, South Carolina 29208.
16
Indian Institute of Technology Guwahati, Assam 781039.
17
J. Stefan Institute, 1000 Ljubljana.
18
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
19
Novosibirsk State University, Novosibirsk 630090.
20
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
21
University of Maribor, 2000 Maribor.
22
University of Hawaii, Honolulu, Hawaii 96822.
23
Faculty of Mathematics and Physics, Charles University, 12116 Prague.
24
Max-Planck-Institut für Physik, 80805 München.
25
National Central University, Chung-li 32054.
26
Hanyang University, Seoul 133-791.
27
Korea Institute of Science and Technology Information, Daejeon 305-806.
28
Sungkyunkwan University, Suwon 440-746.
29
Wayne State University, Detroit, Michigan 48202.
30
Excellence Cluster Universe, Technische Universität München, 85748 Garching.
31
Moscow Physical Engineering Institute, Moscow 115409.
32
Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
33
Department of Physics, Technische Universität München, 85748 Garching.
34
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
35
Nara Women's University, Nara 630-8506.
36
Peking University, Beijing 100871.
37
Department of Physics, National Taiwan University, Taipei 10617.
38
Graduate School of Science, Nagoya University, Nagoya 464-8602.
39
Department of Physics, Tohoku University, Sendai 980-8578.
40
Indiana University, Bloomington, Indiana 47408.
41
Kyungpook National University, Daegu 702-701.
42
Kennesaw State University, Kennesaw, Georgia 30144.
43
Chonnam National University, Kwangju 660-701.
44
Niigata University, Niigata 950-2181.
45
Soongsil University, Seoul 156-743.
46
Korea University, Seoul 136-713.
47
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
48
Ludwig Maximilians University, 80539 Munich.
49
Punjab Agricultural University, Ludhiana 141004.
50
Tokyo Metropolitan University, Tokyo 192-0397.
51
Yonsei University, Seoul 120-749.
52
University of Science and Technology of China, Hefei 230026.
53
CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
54
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
55
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
56
Utkal University, Bhubaneswar 751004.
57
INFN-Sezione di Torino, 10125 Torino.
58
Osaka City University, Osaka 558-8585.
59
Aligarh Muslim University, Aligarh 202002.
60
Toho University, Funabashi 274-8510.
61
Kanagawa University, Yokohama 221-8686.
62
Luther College, Decorah, Iowa 52101.
63
University of Bonn, 53115 Bonn.
64
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
65
Seoul National University, Seoul 151-742.
66
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
67
University of the Basque Country UPV/EHU, 48080 Bilbao.
68
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
69
Institute of High Energy Physics, Vienna 1050.
70
Yamagata University, Yamagata 990-8560.
71
Tokyo Institute of Technology, Tokyo 152-8550.
72
Institute for High Energy Physics, Protvino 142281.
73
University of Nova Gorica, 5000 Nova Gorica.
74
Gifu University, Gifu 501-1193.
75
University of Torino, 10124 Torino.
76
Justus-Liebig-Universität Gießen, 35392 Gießen.
77
National United University, Miao Li 36003.
78
University of Florida, Gainesville, Florida 32611.
79
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.

Abstract

We measure the decay B_{s}^{0}→K^{0}K[over ¯]^{0} using data collected at the ϒ(5S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. The data sample used corresponds to an integrated luminosity of 121.4  fb^{-1}. We measure a branching fraction B(B_{s}^{0}→K^{0}K[over ¯]^{0})=[19.6_{-5.1}^{+5.8}(stat)±1.0(syst)±2.0(N_{B_{s}^{0}B[over ¯]_{s}^{0}})]×10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.

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